v0.8.1

Data-quality fixes

• EPSS values at source precision — EPSS scores/percentiles are rounded once at parse time to FIRST.org's published 5-decimal precision, so tool output can never surface float-repr artifacts (e.g. 0.016540000000000003).
• Reconciling include_stats breakdowns — entries without a severity rating or impact category (e.g. Chromium CVEs) now appear as explicit Unrated/Unspecified buckets, so severity/impact counts always sum to the reported total. Buckets are only emitted when non-zero; default JSON shape unchanged.
• Known-issues retrieval fixed for migrated KB pages — support.microsoft.com moved KB articles to /servicing/os/... URLs (a second redirect hop + new page markup). The fetcher now follows a bounded, validated same-host redirect chain and parses both markup generations; the honest published/none_published/unavailable status contract is unchanged.